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The quadriceps femoris muscle group flexes the thigh at the hip, extends the leg (i.e. straightens the knee), and adducts the leg. The quadriceps are located at the anterior thigh. It is a muscle that reacts with hamstrings and gastrocnemius. The four muscles in this group are the rectus femoris, vastus medius, vatus lateralis, and the vastus intermedius.

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10y ago

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